Thanks for the Feed-back.. Its appreciated.
We played that the Serpent could not Score (hence the NS for Victory points reasons) but that all vehicles could contest the Bunkers (I had to give him some leaniency as I chose the mission, etc) and I did fail to remove it completely..... It was a simple adjustment we made to the game as he was really limited to the figures he owned and had onhand (although I did offer to lend him some of mine - out in the car).... As mentioned, he was a pretty new to Eldar , with only a half dozen or sa games under his belt (normally uses Space Marines - BA) so I had enough advantage to give him a couple of "freebies" or rule modifications.
In later duscussion I noted how I used mass firepower to remove his priority units first (DR, PF's, etc...).. to systematically cripple and kill his army. He even noted that he thought his first Farseer was safe until I actually killed the whole Scorpion squad and made the Farseer "targetable" (he underestimated the firepower of Necrons)... We also discussed things that he should have done... Assault the Banshees right up the middle to take out the Lord (possible on turn 2), thus denying a lot more WBB rolls... and saturation of target units to remove them completely to deny WBB, etc.... I am pretty sure that he will be a much better general in his future games, and although I don't mind educating people as we play, I was not about to hand him a victory either.
PS.. If his WL had of stayed where it was to start with, yes it could have shot for the entire game and possibly held the bunker; but I think I would have simply devoted a round or two or Mass Destroyer firepower to it; and probalby taken it out, (Mathhammer - 14 Destroyers put out 42 shots, with 30 hitting... thats probably enough to get teh job done, even vs a Wraithlord) and shooting his Falcon/Serpent was pretty useless to me anyway, f--- ing HF, VE's Stones etc made them too good vs Gause only... I could never Pen one as he was smart enough to deny me Rear Armour.